Piecewise linear digital signal processor as for digital video v

Details Piecewise linear digital signal processor as for digital video v Piecewise linear digital signal processor as for digital video v

1984-04-12

1986-11-04

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 37, 358 40, 358 31, H04N 514

Patent

active

046212906

ABSTRACT:
In processing comb filtered video signals it is desirable to separate lower frequency vertical detail signal from comb filtered chrominance and recombine it with the comb filtered luminance signal. System response is enhanced if the vertical detail is non-linear processed before it is recombined with luminance. To core, peak and pare digital vertical detail signal, the signal is passed through an absolute value circuit and then applied to a first signal combiner wherein a first reference value is subtracted from the magnitudes of the input signals. The differences are applied to a polarity discriminator which passes difference values of only one polarity. The one polarity differences are scaled and applied to one input port of a signal combining circuit. The one polarity differences are also applied to a third signal combining circuit wherein a second reference value is subtracted from the one polarity differences to produce a double difference value. The double difference value is applied to a second polarity discriminator which couples one polarity double difference values to a second input port of the second signal combining circuit, the output of which exhibits a piecewise linear, non-linear transfer characteristic.

REFERENCES:
patent: 4245237 (1981-01-01), Lagoni
patent: 4316215 (1982-02-01), Yasumoto et al.
patent: 4386434 (1983-05-01), Gibson et al.
patent: 4422094 (1983-12-01), Lewis, Jr. et al.
Pritchard, D. H., "A CCD Comb Filter for Color TV Receiver Picture Enhancement", RCA Review, vol. 41, Mar. 1980, pp. 3-28.

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